Valve



Patented Nov, 10, 1925.

UNITED STATES 11,561,367 PATENT orrlca.

CHAR L ES C. SPREEN, OF DETROIT, MICHIGAN, ASSIGNOR, BY MESA TE ASSIGNKENTS,

TO xnnvmaron CORPORATION,

A CORPORATION OF MICHIGAN.

- VALVE.

Application filed August 4-, Serial No. 728,940.

To all whom it may concern: Be it known that I, CHARLES C. Srunux, aicitizen of the United States of America. and a resident of Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Valves, of which the following is -a full, clear, and exact description. Inasmuch as refrigerating units for house- 1 hold use are normally operated over long periods without skilled attention it is necessary to construct these units so that failure is practically impossible. Heretofore an appreciable partof the relatively few failures has occurred in the expansion valve "which probably caused by binding of the valve in I (lensing coil of the refrigerating system, an

customarily. forms a part of each such refrigerating unit: Ilpon analysis it appears that failure of the expansion valve is usually due 'to sticking and that this-sticking is the supportingeuide-way due I to lateral with cooperating screw threads 0. carried by the casing 11.and, when so posi ioned, to tlghtly' engage the annular shoulder 19 thro'ugha packing ring 26 and thus connect theaperture in the casing 11 to an apertu re'2 7 1n a valve seat 28 formed integfal with the housing 25. This valve unit 1'23 also includes a valve 29 arranged to seat in and close the opening 27 within the valve seat 28 and supported by means of a triangular member integral with the valve 29 and reciprocably mounted within the housing 25. I a

This valve 29 is urged to seating position by a spring 31 compressed between a plate 32 which abuts. the triangular portion 30 of the valve 29 andan annular plug 33 po sitioned within the housing 25 and maintained in position by engagement of its screw threads 34 with cooperating screw threads 35 carried by the housing 25. The

thrust of the valve operating spring. My transmission oflateral strain or movement invention provides means 'culty is overcome.

In the drawings accompanying this sp'eci-. fication and forming a. part thereof I have shown, for purposes of illustration, one form which my invention may assume. Tn these drawingsz.

Figure 1 is a vertical section through the expansion valve embodying this illustrative form of my invention, a Figure 2 is a section on' Figure 1, while Figure. 3 is an elevation of the intermedi "ate member. a a

The. form of my invention herein shown comprises acasing 11 provided with an inlet 12 arranged to be connected to the con the line 2 -2 of outlet 13 arranged to be-connected to the} expansion coil of the refrigerating system, anopening 16 'for insertion of the valve unit 17 normally closed bv a screw-threaded plug 18, an annular shoulder 19 arranged to cooperate with the ,valve unit 17 and forming a restricted passage 20, and an open face 21 adapted to be closed bymans of a plate 22 arranged to suppdrt a suitable diaphragm 23 within the-diaphragm chamber 24 defined by the face 21 and the plate 22.

i The valve-unit 17 herein shown comprises ahous'ing 25 arranged ,to be held in position withih the casing 11 by the engagement of. screw threads 39 carried by. the-housing 25 between the'spring 31 and the valve 29 is prevented by inter-positioning the plate 32 of the valve 29 in such manner that these surfaces engage at substantially a single I away one or both of the inter-engaging surfaces, for example, by rounding, as shown herein, the engaging surface '60 of the triangularIportioh 30 of the valve29.

The valve 29 is reciprocated away from the, valve seat 28 against the actionof the spring 31 by means of the diap gm 23 acting in response to'the combine nfluenoe of the change in pressure within the diaphragm chamber 24 and the spring 38 mounted within a tubular extension 40 formed integral with the plate 22 and herein shown as closed by means of a solidiplate 32 screw-threaded within the tubulan'extension 40. 1

It will be apparent from the above description that in the expansion Ive herein shownthe inter-p sitioning of eplate 32 and the formation of the inter-engaging surfaces of the plate 32 and the triangular portion 30 of the valve 29 efl'ectively prevents the transmission of lateral strains and movements between the spring 31 and valve 29 and thus effectively removes what is at the present time the chief cause of failure in It will beapparent, of course, that the particular construction herein shown may be variously changed and modified without sacrificing the advantages of myfiffiention or departing from vthe spirit thereof and that my invention -is applicable to valves other than the type herein shown. It will therefore be understood that the disclosure herein is illustrative only and that my invention is not limited thereto.

Iclaim:

An expansion valve comprising: a easing provided with an interior wall separating the space interiorly of said easing into an inlet chamber and an outlet chamber and pierced by an aperture adapted to afford communication between said chambers, one

of said chambers comprising an elongated tubular recess alined with said aperture; a valve unit comprislng a frame carrylng the entire unit, of substantially even cross section throughout, removably positioned within said recess with its forward end abutting said frame, an adjustable abutment mounted in the said rear end of said frame. and a spring tenslonedbetween said valve head and said abutment with its tension adjustable by adjustment of the position of said abutment; and a plug closing the outer end of said recess removable to permit bodily removal of said unit. q 4 I 1 In testimony whereof, I hereunto aflix my signature.

' CHARLES C. SPREEN. 

